Cylindrical workpiece centering measurement device

Abstract

The utility model discloses a cylindrical workpiece centering measuring device which is characterized in that the device comprises a mandrel (1), one end of the mandrel (1) is fixedly connected with a camera (2), the mandrel (1) is provided with a front positioning mechanism (3) and a rear positioning mechanism (4), and an axial positioning sleeve (5) located between the front positioning mechanism (3) and the rear positioning mechanism (4) is sleeved outside the mandrel (1). An operator only needs to carry out simple operation, the front positioning mechanism (3) and the rear positioning mechanism (4) can be synchronously tensioned in the cylindrical workpiece at the same time, and when the device is connected with the workpiece, the axis of the core shaft (1) is kept coaxial with the axis of the workpiece, so that the workpiece can be positioned synchronously. By means of the device, it can be ensured that the optical center axis of the camera (2) and the center axis of the cylindrical workpiece are strictly kept in a coaxial state, and follow-up measurement operation is facilitated.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of workpiece parameter's determination and measurement, especially a cylindrical workpiece centering measuring device. BACKGROUND

[0002] When processing a certain type of cylindrical or tubular workpiece, it is often necessary to detect whether the axis line meets the accuracy requirement, especially for some military products, the above detection is particularly important, because the accuracy of the central axis line of such parts is directly related to the product quality. But because the central axis line of the cylindrical or tubular workpiece is a virtual straight line, it cannot be directly detected, so the traditional method is to take a standard (i.e. the central axis line meets the accuracy requirement) similar workpiece, insert an optical measuring device into the above standard workpiece, convert the mechanical axis of the workpiece into the optical axis of the measuring device, and then use the detection tool composed of the standard workpiece and the optical measuring device to detect the central axis line of the cylindrical workpiece.

[0003] Traditionally, in order to construct the above detection tool, an elongated mandrel is inserted into the standard tubular workpiece, and the end of the mandrel is connected with a camera. In order to make the axis line of the elongated mandrel fixed in the tubular workpiece keep coaxial with the axis line of the tubular workpiece, two sets of elastic sheets are arranged at the tail end of the mandrel to realize positioning, but it is found in the use process that, because the mechanism belongs to a cantilever structure, the end with the camera will slightly droop, resulting in a small angle between the axis line of the mandrel and the axis line of the tubular workpiece, i.e. the mechanical axis and the optical axis cannot keep coaxial relationship, thus causing a large error in judging the consistency of the two axis lines in the later stage, affecting the measurement accuracy.

[0004] If two sets of elastic sheets are arranged at positions spaced apart at a certain distance on the mandrel, although it can solve the problem of cantilever droop in theory, the elastic sheets inserted into the tubular workpiece cannot be operated and adjusted, which will make it difficult for the operator to adjust the elastic sheets (or even impossible to adjust the elastic sheets), and the elastic sheets cannot be used to fix the mandrel in the tubular workpiece.

[0005] Therefore, there is a need for a method or device that can solve the above problems. SUMMARY

[0006] The utility model is to solve the above-mentioned deficiencies existing in the prior art, propose a cylindrical workpiece centering measuring device with simple structure, ingenious design and reasonable layout, which can ensure that the mandrel and the tubular workpiece keep coaxial, and can be operated outside the tube to realize positioning between the mandrel and the tubular workpiece.

[0007] The utility model discloses a technical solution is: a cylindrical workpiece centering measuring device, it is characterized by: the device includes the mandrel 1, one end of mandrel 1 is fixedly connected with camera 2, be provided with front positioning mechanism 3 and rear positioning mechanism 4 on mandrel 1, still mandrel 1 outside still has the axial positioning sleeve 5 of being located between front positioning mechanism 3 and rear positioning mechanism 4,

[0008] The front positioning mechanism 3 includes the elastic sleeve 6 of being sleeved on the mandrel 1, the elastic sleeve 6 is provided with the positioning sleeve outside, the positioning sleeve is formed by multiple positioning sleeve subpackaging 7, multiple positioning sleeve subpackaging 7 are evenly distributed in the circumferential direction, two first annular grooves 8 are arranged on the outer wall of the positioning sleeve subpackaging 7, all positioning sleeve subpackaging 7 are tightly embraced on the outer wall of the elastic sleeve 6 by the annular spring 9 arranged in the first annular groove 8, one locking sleeve 10 is arranged at the both ends of the elastic sleeve 6, and the two locking sleeves 10 are symmetrically distributed, one end of the locking sleeve 10 is a conical guide part 11, the conical guide part 11 is matched with the port part of the elastic sleeve 6, the two end faces of the positioning sleeve subpackaging 7 are provided with arc grooves 12, multiple arc grooves 12 form a second annular groove, a limit ring plate 13 is arranged in the second annular groove, the width of the limit ring plate 13 is less than the width of the second annular groove, the limit ring plate 13 is fixedly connected on the positioning sleeve subpackaging 7 by multiple bolts 14 evenly distributed in the circumferential direction, and the bolt 14 is movably connected in the radial adjusting groove 15 arranged on the limit ring plate 13, of the two locking sleeves 10, one is in contact with the end face of the positioning sleeve 5, and the other is in contact with the locking nut 16 screwed on the mandrel 1,

[0009] The rear positioning mechanism 4 has the same structure as the front positioning mechanism 3, and the two locking sleeves 10 in the rear positioning mechanism 4 are in contact with the end face of the positioning sleeve 5 and the limit stop ring 17 at the tail end of the mandrel 1.

[0010] Compared with the prior art, the utility model has the following advantages:

[0011] The cylindrical workpiece centering measuring device has the advantages of simple structure, ingenious design, reasonable layout, special structure designed for the problems existing in the traditional cylindrical workpiece axis detection device, two sets of positioning mechanisms that can be tightly expanded in the cylindrical workpiece to support the mandrel in a non-cantilever state to ensure that the axis of the mandrel is in precise collinear state with the axis of the cylindrical workpiece, the operator can drive the synchronous action of the two sets of positioning mechanisms by operating externally, which is very convenient and reliable. The manufacturing process is simple and the manufacturing cost is low, so it has many advantages and is especially suitable for popularization and application in this field, and has a very broad market prospect. Attached Figure Description

[0012] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model.

[0013] Figure 2 yes Figure 1 Enlarged view of part A in the image.

[0014] Figure 3 This is a front view of the front positioning mechanism in an embodiment of this utility model. Detailed Implementation

[0015] The specific embodiments of this utility model will be described below with reference to the accompanying drawings. Figure 1 , Figure 2 , Figure 3 As shown: A cylindrical workpiece centering and measuring device includes a mandrel 1, one end of which is fixedly connected to a camera 2. A front positioning mechanism 3 and a rear positioning mechanism 4 are arranged on the mandrel 1. An axial positioning sleeve 5 is also sleeved on the mandrel 1 between the front positioning mechanism 3 and the rear positioning mechanism 4.

[0016] The front positioning mechanism 3 includes an elastic sleeve 6 sleeved on the spindle 1. A positioning sleeve is provided outside the elastic sleeve 6. The positioning sleeve is composed of multiple positioning sleeve units 7, which are evenly distributed circumferentially. Two first annular grooves 8 are provided on the outer wall of each positioning sleeve unit 7. All positioning sleeve units 7 are held tightly against the outer wall of the elastic sleeve 6 by annular springs 9 provided within the first annular grooves 8. A locking sleeve 10 is provided at each end of the elastic sleeve 6, and the two locking sleeves 10 are symmetrically distributed. One end of each locking sleeve 10 is a conical guide portion 11, which connects to the end portion of the elastic sleeve 6. The positioning sleeve assembly 7 is matched with the positioning sleeve. Arc-shaped grooves 12 are formed on both end faces of the positioning sleeve assembly 7. Multiple arc-shaped grooves 12 together form a second annular groove. A limiting ring plate 13 is provided within the second annular groove. The width of the limiting ring plate 13 is smaller than the width of the second annular groove. The limiting ring plate 13 is fixedly connected to the positioning sleeve assembly 7 by multiple bolts 14 evenly distributed in the circumferential direction. The bolts 14 are movably connected to radial adjustment grooves 15 formed on the limiting ring plate 13. Of the two locking sleeves 10, one contacts the end face of the positioning sleeve 5, and the other contacts the locking nut 16 threaded onto the spindle 1.

[0017] The structure of the rear positioning mechanism 4 is the same as that of the front positioning mechanism 3, and one of the two locking sleeves 10 in the rear positioning mechanism 4 contacts the end face of the positioning sleeve 5, and the other contacts the limiting retaining ring 17 at the tail end of the spindle 1.

[0018] The working process of the cylindrical workpiece centering measuring device is as follows: firstly, the front positioning mechanism 3 and the rear positioning mechanism 4 on the mandrel 1 are inserted into a standard tubular workpiece 18, and the locking nut 16 is ensured to be located outside the tubular workpiece 18, at this time, a certain gap exists between the positioning sleeves in the two positioning mechanisms and the inner wall of the tubular workpiece 18, that is, the mandrel 1 and the tubular workpiece 18 do not form a connection relationship;

[0019] Then, the locking nut 16 is rotated, since the locking nut 16 is in threaded connection with the tubular workpiece 18, the locking nut 16 will move linearly in the axial direction of the tubular workpiece 18, the locking nut 16 extrudes the locking sleeve 10 in contact with the locking nut 16, the conical guide part 11 at the end of the locking sleeve 10 is inserted into the inside of the port of the elastic sleeve 6, since the other end of the elastic sleeve 6 is also provided with the locking sleeve 10, the elastic sleeve 6 will be extruded in two directions, so that the elastic sleeve 6 is deformed in the radial direction, the expansion deformation of the elastic sleeve 6 enables the plurality of positioning sleeve subassemblies 7 wrapped outside the elastic sleeve 6 to move outward along the radial direction, the annular spring 9 is stretched, and the outer wall of the positioning sleeve subassembly 7 is in contact with the inner wall of the tubular workpiece 18 and is expanded and fixed in the tubular workpiece 18,

[0020] It should be noted that when the locking nut 16 pushes the locking sleeve 10 in contact with the locking nut 16 to move in the axial direction, the movement is transmitted to the rear positioning mechanism 4 through the axial positioning sleeve 5 when the elastic sleeve 6 has not been deformed completely, the elastic sleeve 6 in the rear positioning mechanism 4 also changes as described above, that is, the operator only needs to operate the locking nut 16 to drive the two positioning mechanisms to expand at the same time, so that the mandrel 1 and the tubular workpiece 18 are fixed,

[0021] Since all the positioning sleeve subassemblies 7 in the same positioning mechanism move synchronously at the same time, the automatic centering function can be realized after expansion, so as to ensure the coaxiality of the mandrel 1 and the tubular workpiece 18;

[0022] After the mandrel 1 is fixed in the tubular workpiece 18, the locking nut 16 is loosened, the locking nut 16 always applies pressure to the locking sleeve 10 in contact with the locking nut 16 under the action of the thread, so that the mandrel 1 and the tubular workpiece 18 remain in a connected state;

[0023] The tubular workpiece 18 connected with the mandrel 1 and the camera 2 has a mechanical axis coinciding with the axis of the mandrel 1, since the optical central axis of the camera 2 coincides with the axis of the mandrel 1, the optical central axis of the camera 2 coincides with the axis of the tubular workpiece 18;

[0024] Only the mandrel 1 needs to be inserted into the tubular workpiece 18 with different diameters and the above operation is repeated, so that detection tools with different diameters can be constructed.

[0025] When the positioning sleeve assembly 7 moves radially, because the size of the limiting ring plate 13 is fixed, when the inner wall of the arc-shaped groove 12 on the positioning sleeve assembly 7 contacts the inner wall of the limiting ring plate 13, the positioning sleeve assembly 7 cannot continue to move, that is, the size of the limiting ring plate 13 limits the movement stroke of the positioning sleeve assembly 7;

[0026] When the axial force at both ends of the elastic sleeve 6 is removed, the elastic sleeve 6 returns to the initial state, and all the positioning sleeve assemblies 7 are also recovered under the action of the annular spring 9, and the mandrel 1 restores the freedom degree and can be pulled out of the tubular workpiece 18.

Claims

1. A cylindrical workpiece centering measuring device characterized by: The device includes a mandrel (1), one end of the mandrel (1) is fixedly connected with a camera (2), a front positioning mechanism (3) and a rear positioning mechanism (4) are arranged on the mandrel (1), and an axial positioning sleeve (5) is further sleeved on the mandrel (1) between the front positioning mechanism (3) and the rear positioning mechanism (4), The front positioning mechanism (3) includes an elastic sleeve (6) sleeved on the mandrel (1), a positioning sleeve is arranged outside the elastic sleeve (6), the positioning sleeve is composed of a plurality of positioning sleeve subassemblies (7), the plurality of positioning sleeve subassemblies (7) are uniformly distributed in the circumferential direction, two first annular grooves (8) are arranged on the outer wall of the positioning sleeve subassembly (7), all the positioning sleeve subassemblies (7) are tightly held on the outer wall of the elastic sleeve (6) through the annular spring (9) arranged in the first annular groove (8), one locking sleeve (10) is arranged at each end of the elastic sleeve (6), and the two locking sleeves (10) are symmetrically distributed, one end of the locking sleeve (10) is a conical guide portion (11), the conical guide portion (11) is matched with the port portion of the elastic sleeve (6), arc-shaped grooves (12) are arranged on the two end faces of the positioning sleeve subassembly (7), the plurality of arc-shaped grooves (12) jointly form a second annular groove, a limiting ring plate (13) is arranged in the second annular groove, the width of the limiting ring plate (13) is smaller than the width of the second annular groove, the limiting ring plate (13) is fixedly connected to the positioning sleeve subassembly (7) through a plurality of bolts (14) uniformly distributed in the circumferential direction, and the bolt (14) is movably connected in a radial adjusting groove (15) arranged on the limiting ring plate (13), of the two locking sleeves (10), one is in contact with the end face of the positioning sleeve (5), and the other is in contact with a locking nut (16) threadedly connected to the mandrel (1), The rear positioning mechanism (4) has the same structure as the front positioning mechanism (3), and of the two locking sleeves (10) in the rear positioning mechanism (4), one is in contact with the end face of the positioning sleeve (5), and the other is in contact with a limiting stop ring (17) at the tail end of the mandrel (1).

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